Soloing is often described as the most pure and dangerous form of climbing. For all of us, testing the limit of what's comfortable, whether that's scrambling up 5.3 terrain or spending fifty days on a big wall alone, is an unparalleled mental and physical exploration.

We at Alpinist asked the most inspiring solo climbers we know—those defining the edge of what's humanly possible—to tell us more about their rare connection to the vertical world.

After exploring the minds of rock master Alex Honnold, big wall diva Silvia Vidal, and ice climber Guy Lacelle, we ask Alexander Huber what it takes to free solo the some of the most exposed and extreme routes—up to 5.14a—without protection. Discover how Alex got started and how he contemplates free soloing today.

1. Please tell us a little bit about yourself.

In the Bavarian town of Trostberg, in 1968, I was born into a family familiar with climbing. My brother Thomas and I began climbing together seriously in 1983, and since then we have focused on many different genres of climbing.

2. How did you become a professional climber?

In 1997 I finished my studies, and I was working as a physicist in the Institute of Theoretical Meteorology in Munich. Additionally I continued to give slide shows about climbing all over Europe. The slide shows were such a success that I finally decided to stop working as a physicist to become a professional speaker and climber.

3. What is your perspective on free soloing, and how did you get into it?

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Free soloing is too forbidding for it to ever become popular. It is an activity for those with a precise knowledge of their own ability.

I did my first solo climbs when I was about 22 years old. When I was studying in Munich, I couldn't always find climbing partners, so I went to the mountains alone to do classic multipitch routes, most of them 5.9. Only after many years of experience on wild climbs did I feel ready for my dream: to free solo a hard, exposed and big alpine face.

4. Please list your most notable free solo ascents. Why is each special for you?

My biggest was definitely the Direttissima, my most difficult Kommunist. But the scariest free solo was Mescalito: it has a technically super-hard crux move in a very exposed position. The route is not very long, but it starts some 50 meters above the ground, so the exposure feels like a multipitch climb.

I free solo any kind of terrain—vertical icefalls as well as hard sport climbing and multipitch routes. But a route has to catch my interest somehow. Like the Direttissima: to me the idea, to climb through such an overhanging 500-meter face, had been so challenging that I couldn't resist giving it a chance...

6. What is free soloing like? How does it affect your life?

Free soloing makes me feel satisfied. It's one way to reach the state of happiness. And its intensity creates the strongest possible memories. My experiences free soloing make my life colorful like nothing else.

When free soloing, my whole thinking is focused on nothing besides the climbing. The world is concentrated, and only the few square inches of the next hold matter. I control the fear of falling through self confidence, which makes it possible for fear to heighten concentration, not cause any nervousness. Your life is the highest possible stake, so the outcome is more intense than with any other kind of climbing.

7. Why do you wear a helmet to free solo climbs such as the Brandler-Hasse and the south face of the Dent du Geant? What use does it have?

In case a rock hits my head. Rockfall is a kind of danger that you cannot control, so I use a helmet. I also wear a helmet on any alpine climb that has significant rockfall danger.